package com.newer.hospital.utils;

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.util.Random;

import javax.imageio.ImageIO;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;



public class RandomValidateCodeUtil {

	 public static final String RANDOMCODEKEY= "RANDOMVALIDATECODEKEY";//放到session中的key
	 private String randString = "0123456789";//随机产生只有数字的字符串 private String
	 //private String randString = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";//随机产生只有字母的字符串
	 //private String randString = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";//随机产生数字与字母组合的字符串
	 private int width = 95;// 图片宽
	 private int height = 25;// 图片高
	 private int lineSize = 40;// 干扰线数量
	 private int stringNum = 4;// 随机产生字符数量
	 
	 private static final Logger logger = LoggerFactory.getLogger(RandomValidateCodeUtil.class);
	 
	 private Random random = new Random();
	 
	 /**
	  * 获得字体
	  */
	 private Font getFont() {
	  return new Font("Fixedsys", Font.CENTER_BASELINE, 18);
	 }
	 
	 /**
	  * 获得颜色
	  */
	 private Color getRandColor(int fc, int bc) {
	  if (fc > 255)
	   fc = 255;
	  if (bc > 255)
	   bc = 255;
	  int r = fc + random.nextInt(bc - fc - 16);
	  int g = fc + random.nextInt(bc - fc - 14);
	  int b = fc + random.nextInt(bc - fc - 18);
	  return new Color(r, g, b);
	 }
	 
	 /**
	  * 生成随机图片
	  */
	 public void getRandcode(HttpServletRequest request, HttpServletResponse response) {
	  HttpSession session = request.getSession();
	  // BufferedImage类是具有缓冲区的Image类,Image类是用于描述图像信息的类
	  BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_BGR);
	  Graphics g = image.getGraphics();// 产生Image对象的Graphics对象,改对象可以在图像上进行各种绘制操作
	  g.fillRect(0, 0, width, height);//图片大小
	  g.setFont(new Font("Times New Roman", Font.ROMAN_BASELINE, 18));//字体大小
	  g.setColor(getRandColor(110, 133));//字体颜色
	  // 绘制干扰线
	  for (int i = 0; i <= lineSize; i++) {
	   drowLine(g);
	  }
	  // 绘制随机字符
	  String randomString = "";
	  for (int i = 1; i <= stringNum; i++) {
	   randomString = drowString(g, randomString, i);
	  }
	  logger.info(randomString);
	  //将生成的随机字符串保存到session中
	  session.removeAttribute(RANDOMCODEKEY);
	  session.setAttribute(RANDOMCODEKEY, randomString);
	  g.dispose();
	  try {
	   // 将内存中的图片通过流动形式输出到客户端
	   ImageIO.write(image, "JPEG", response.getOutputStream());
	  } catch (Exception e) {
	   logger.error("将内存中的图片通过流动形式输出到客户端失败>>>> ", e);
	  }
	 
	 }
	 
	 /**
	  * 绘制字符串
	  */
	 private String drowString(Graphics g, String randomString, int i) {
	  g.setFont(getFont());
	  g.setColor(new Color(random.nextInt(101), random.nextInt(111), random
	    .nextInt(121)));
	  String rand = String.valueOf(getRandomString(random.nextInt(randString
	    .length())));
	  randomString += rand;
	  g.translate(random.nextInt(3), random.nextInt(3));
	  g.drawString(rand, 13 * i, 16);
	  return randomString;
	 }
	 
	 /**
	  * 绘制干扰线
	  */
	 private void drowLine(Graphics g) {
	  int x = random.nextInt(width);
	  int y = random.nextInt(height);
	  int xl = random.nextInt(13);
	  int yl = random.nextInt(15);
	  g.drawLine(x, y, x + xl, y + yl);
	 }
	 
	 /**
	  * 获取随机的字符
	  */
	 public String getRandomString(int num) {
	  return String.valueOf(randString.charAt(num));
	 }
	}